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  1. #1
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    data over dc power

    Hi,

    Does anybody heard about cicrcuits that can transmit serial data and suply circuits over 1-pair (2-wire only ) power line. ( up to 2400...4800 Bd, up to 2000Ft. )

    I've heard about HART protocol, but it's industrial one. I want make my own drivers and cicrcuits.

    Are there any specialized chips ??
    Does anybody heard about it ??

    Regards,

    Al555

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    data over dc

    First you have a low pass filter for the power connection and a high pass filter for the data.

    Then you can use ordinary telephone modem type communications. The only thing you will have to take care of is the on-off hook sensing because there is no DC level to sense and also the lack of a dial tone.



  3. #3
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    how to transmit data over power supply lines

    The serial signal must be encoded with a RZ encoding (i.e. Manchester) and then it can be superimposed on DC supply voltage.
    Infact the signal so encoded have no DC components and to achieve galvanic isolation you may also use transfomer between the serial driver/receiver ant the line (before of the bypass capacitors)



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  4. #4
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    dc power line modem

    for such a long distance, use of a decent error-detection algorithm like CRC is a must.



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    data over dc line

    Any ideas for transfer over AC (low voltage 12V)?



  6. #6
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    data over 2 wires

    This is quite comonly done on fire alarm systems, then you can have your detectors all connected to the same two wires. Saves wiring!
    You can use telecom DTMF chips (dual tone multi frequency) for the encoding and decoding. They are cheap and widley available. You just have to write your own protocol.


    2 members found this post helpful.

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  7. #7
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    data communication over dc power line

    imxo, try to www.google.com -> "Power Line Modem"

    http://www.hth.com/plm-24/plm-24.htm



  8. #8
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    power and data over two wires

    Use this chip it will do the work for you

    best

    Bobi



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    data and power over 2 wires

    why didnt you try RS485 protocol it's simply like RS232 but Halfduplix and u detremine the direction by logically from one pin.. using 75176 from texas instruments.
    it could travel through 1500 mt.
    search more at google
    regards

    Added after 43 seconds:

    why didnt you try RS485 protocol it's simply like RS232 but Halfduplix and u detremine the direction by logically from one pin.. using 75176 from texas instruments.
    it could travel through 1500 mt. over shielded twisted pair wire (2 wires)
    search more at google
    regards



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    lin over dc

    Hi bobcat1,

    Where can you buy this chip?
    Who is the supplier and is it widly avilable?
    Had you ever used it?

    Thanks.



  11. #11
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    transmit data on power supply line

    Hello Gidimiz

    This chip maufecturerd by simens for EIB power communication protocol

    Search EIB or TPuart in google and you will find DS and source code how to connect

    All he best


    Bobi



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  12. #12
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    sending data over 5v dc supply

    In topic https://www.edaboard.com/viewtopic.php?p=409011#409011
    there is proprietary protocol http://www.apollo-fire.co.uk/PDFs/PP...XP95%20EPG.pdf

    It looks they took 4-20 current loop as base and send digitized output using loop as power supply as well . For example 0 is 5 ma, 1 is 20 ma .
    On receiver end you have to implement current detector comparator .


    For slow signal rate it is the best price solution .



  13. #13
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    dc powerline modem

    Bobi, about the EIA-TP-UART-IC

    First thank you very much for an interesting information. Then questions:
    1. Your datasheet from 25.10.01 seems to be newer, than the one from the Siemans page. Where from is it? But the same time the document number of your DS 25.15.10.41.33a seems to be older, than of the Siemens: 25.15.14.41.34a. Contradiction?
    2. Where can I buy this chip? First I need a small quantity and then about 100. Please, can you recommend a supplier? I found only one in Russia, but they sell only very large quantities.
    3. Can you recommend, where on the web one can find the best tech. information about the EIB. I tried to find by Google, and received a lot of noise. I think to use it on the new Gamma-Ray telescope MAGIC-II to be built soon on La-Palma.

    Thank you very much in advance,

    Varuzhan



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    Re: sending data over 5v dc supply

    Respected sir,
    This link "http://www.apollo-fire.co.uk/PDFs/PP1039%20XP95%20EPG.pdf" is dead.Can you please provide me the new address or the pdf file.
    Thanks and regard,
    Rahul



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